CALCIUM CYANAMIDE
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(Redirected from Frank-Caro process)
'Calcium cyanamide' or 'CaCN2' is a calcium compound used as fertiliser, first synthesized in 1898 by Adolph Frank and Nikodem Caro. It is formed when calcium carbide reacts with nitrogen. It is commercially known as Nitrolim
: CaC2 + N2 → CaCN2 + C
The reaction takes place in large steel chambers. An electric carbon element heats the reactants to red heat. Nitrogen is pressurised at 2 atmospheres.
It crystalizes in hexagonal crystal system with space group ''R3m'' and lattice constants ''a'' = 3.67, ''c'' = 14.85 (.10-1 nm).[1]
The main use of calcium cyanamide is in agriculture as a fertiliser. In contact with water it decomposes and liberates ammonia:
: CaCN2 + 3 H2O → 2 NH3 + CaCO3
It was used to produce sodium cyanide by fusing with sodium carbonate, which was used in cyanide process in gold mining:
: CaCN2 + Na2CO3 → 2 NaCN + CaO + O2
1. F. Brezina, J. Mollin, R. Pastorek, Z. Sindelar. ''Chemicke tabulky anorganickych sloucenin'' (''Chemical tables of inorganic compounds''). SNTL, 1986.
★ Cyanamide
★
★ History of calcium cyanamide
★ Bioassay of Calcium Cyanamide for Possible Carcinogenicity (CAS No. 156-62-7)
★ Entry at Classical Encyclopedia
'Calcium cyanamide' or 'CaCN2' is a calcium compound used as fertiliser, first synthesized in 1898 by Adolph Frank and Nikodem Caro. It is formed when calcium carbide reacts with nitrogen. It is commercially known as Nitrolim
: CaC2 + N2 → CaCN2 + C
The reaction takes place in large steel chambers. An electric carbon element heats the reactants to red heat. Nitrogen is pressurised at 2 atmospheres.
It crystalizes in hexagonal crystal system with space group ''R3m'' and lattice constants ''a'' = 3.67, ''c'' = 14.85 (.10-1 nm).[1]
| Contents |
| Uses |
| References |
| See also |
| External links |
Uses
The main use of calcium cyanamide is in agriculture as a fertiliser. In contact with water it decomposes and liberates ammonia:
: CaCN2 + 3 H2O → 2 NH3 + CaCO3
It was used to produce sodium cyanide by fusing with sodium carbonate, which was used in cyanide process in gold mining:
: CaCN2 + Na2CO3 → 2 NaCN + CaO + O2
References
1. F. Brezina, J. Mollin, R. Pastorek, Z. Sindelar. ''Chemicke tabulky anorganickych sloucenin'' (''Chemical tables of inorganic compounds''). SNTL, 1986.
See also
★ Cyanamide
External links
★
★ History of calcium cyanamide
★ Bioassay of Calcium Cyanamide for Possible Carcinogenicity (CAS No. 156-62-7)
★ Entry at Classical Encyclopedia
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